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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Fri Feb 11, 2011 2:38 pm Post subject: Free Press Feb 11, 2011 |
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Not yet started ...
| Code: | Puzzle: FP021111
+-------+-------+-------+
| 2 1 . | . . . | . 8 3 |
| . . 7 | . . 9 | . 6 . |
| . . . | . 2 . | . . . |
+-------+-------+-------+
| 1 . 8 | . . 6 | . 5 . |
| . . 9 | . . . | . . . |
| . 2 . | 5 . . | 7 . 9 |
+-------+-------+-------+
| . . . | . 5 . | . . . |
| . 3 6 | 4 . . | . . . |
| 8 . . | . . . | . 7 2 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Feb 11, 2011 10:52 pm Post subject: |
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Very similar to the Thursday puzzle. In the UR 68-68-684-681, the 1 forces a 4 in r7c1; r7c7<>4.
That makes it a Type 1; r7c9=1. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Feb 11, 2011 11:27 pm Post subject: |
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I had the UR as a type 4: Take out 8 in R7B8 and you force 8 in R6C5 and the puzzle is toast.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Feb 12, 2011 12:39 am Post subject: |
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| I was so infatuated with the pincer thing that I never looked at other options. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Feb 12, 2011 1:13 am Post subject: |
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| Marty R. wrote: | | I was so infatuated with the pincer thing that I never looked at other options. |
Different strokes for different folks.
I am a firm believer that creative solutions for less complicated puzzles equip you to kill the very hard ones in the future.
My UR Type 6 and George Wood's W-wing are prime examples.
I am not sure where the M-wing fits in this discussion. As I recall, the original was a solution of a difficult puzzle.
Keith |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Feb 12, 2011 3:28 pm Post subject: |
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| Marty R. wrote: | Very similar to the Thursday puzzle. In the UR 68-68-684-681, the 1 forces a 4 in r7c1; r7c7<>4.
That makes it a Type 1; r7c9=1. |
Marty.
I have not played Sudoku for some time now and may have forgotten the basics, but I don't follow your logic that r7c7<>4.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Feb 12, 2011 4:25 pm Post subject: |
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| I don't know Ted, I'd have to do it again to answer. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Feb 12, 2011 4:59 pm Post subject: |
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After basics: | Code: | +----------------+----------------+----------------+
| 2 1 45 | 6 47 457 | 9 8 3 |
| 34 8 7 | 13 134 9 | 2 6 5 |
| 9 6 35 | 38 2 58 | 1 4 7 |
+----------------+----------------+----------------+
| 1 7 8 | 2 9 6 | 3 5 4 |
| 345 45 9 | 137 1347 147 | 68 2 68 |
| 6 2 34 | 5 348 48 | 7 1 9 |
+----------------+----------------+----------------+
| 47 9 2 | 178 5 178 | 468 3 168 |
| 57 3 6 | 4 178 2 | 58 9 18 |
| 8 45 1 | 9 6 3 | 45 7 2 |
+----------------+----------------+----------------+ |
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Feb 12, 2011 5:05 pm Post subject: |
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| I definitely screwed up based on Keith's grid. |
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